<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>...</title>
  <style>
    body{
      background: url("../img/1.jpg") no-repeat center;
    }
    .reg-layout{
      width: 900px;
      height: 500px;
      border: 6px solid #EEEEEE;
      background-color: white;
      margin: auto;
    /*//水平居中*/
      margin-top: 15px;

    }
    .rg-left{
      border: 3px solid red;
      float: left;
    }
    .rg-center{
      border: 3px solid red;
      float: left;
      margin-left: 300px;
    }
    .rg-right{
      border: 3px solid red;
      float: right;
    }
  </style>
</head>
<body>
  <div class="reg-layout">
    <div class="rg-left">
      <p>新用户注册</p>
      <p>USER REGIEST</p>
    </div>
    <div class="rg-center">


    </div>
    <div class="rg-right">
      <p>已有账号 <a href="#">立即登录</a></p>
    </div>

  </div>
</body>
</html>